Update to the latest version of your Operating system. If you're using windows, use http://windowsupdate.com What web browser are you using? IE6 with Windows SP2 already has an in-build popup blocker. After updating your OS, get get Firefox - it blocks popups by default (more accurately than IE) as well as being a totally sweet web browser. (A web browser is like Internet Explorer.. of course you can use IE and Firefox at the same time, and Firefox can be easily uninstalled if you don't like it, but I bet you will :D) It's also faster than IE at loading web pages, it's got a far better security track record (vulnerabilities in it are patched within days, rather than the months that it takes Microsoft to fix IE), it's themeable and extendable, and easily customisable. It's got an integrated search bar for easy searching and it also supports web standards far better than IE. Enough reasons? Don't believe me? Just download it and try it out, you'll never look back ;) It's 100% free of course.